chore(deps): pin dependencies (#652)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| containrrr/watchtower | pinDigest |  -> `6dd5076` |
| deluan/navidrome | pinDigest |  -> `efd0b89` |
| httpd | pinDigest |  -> `ba84615` |
| mariadb | pinDigest |  -> `692856b` |
| nitnelave/lldap | pinDigest |  -> `f0f5d92` |

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](https://github.com/renovatebot/renovate/discussions) if that's undesired.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4xNTIuMSIsInVwZGF0ZWRJblZlciI6IjM3LjE1Mi4xIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIn0=-->

Reviewed-on: #652
Co-authored-by: Renovate Bot <renovate@mgrote.net>
Co-committed-by: Renovate Bot <renovate@mgrote.net>

docker-compose/navidrome/docker-compose.yml.j2

@@ -3,7 +3,7 @@ services:
 ######## navidrome-mg ########
   navidrome-mg:
     container_name: "navidrome-mg"
-    image: deluan/navidrome:0.51.0
+    image: deluan/navidrome:0.51.0@sha256:efd0b899e74db3e5063a8c773cfe7d103b0b61ce7021a50f2f9da189591b9dc7
     restart: always
     environment:
       ND_LOGLEVEL: info

docker-compose/watchtower/docker-compose.yml.j2

@@ -3,7 +3,7 @@ services:
   watchtower:
     restart: always
     container_name: watchtower
-    image: containrrr/watchtower
+    image: containrrr/watchtower@sha256:6dd50763bbd632a83cb154d5451700530d1e44200b268a4e9488fefdfcf2b038
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
     environment:

docker-compose/wiki/docker-compose.yml.j2

@@ -2,7 +2,7 @@ version: '3'
 services:
   wiki-webserver:
     container_name: wiki-webserver
-    image: httpd:2.4
+    image: httpd:2.4@sha256:ba846154ade27292d216cce2d21f1c7e589f3b66a4a643bff0cdd348efd17aa3
     restart: always
     networks:
       - traefik

friedhof/lldap/docker-compose.yml.j2

@@ -2,7 +2,7 @@ version: "3"
 services:
 ######## App ########
   lldap:
-    image: nitnelave/lldap:stable
+    image: nitnelave/lldap:stable@sha256:f0f5d92cd6c6dca9415993cfc57919f0618e87090b323a98c1536975860fa45a
     container_name: lldap-app
     restart: always
     ports:
@@ -42,7 +42,7 @@ services:
       - com.centurylinklabs.watchtower.depends-on=lldap-db
 ######## DB ########
   lldap-db:
-    image: mariadb:10
+    image: mariadb:10@sha256:692856b1f36a6e824ff8b8e78929643c90faa5f0931d74425eed52b09e8ac37b
     container_name: lldap-db
     restart: always
     volumes: